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- National Archives (Great Britain), owner885
- Adam Matthew Digital (Firm), digitiser879
- Riewert Tode Collection of German Student Movements and Counter-Culture511
- United States. Congress. House. Committee on Un-American Activities473
- United States405
- Walter L. Pforzheimer Intelligence Collection (Beinecke Rare Book and Manuscript Library)364
- Lenin, Vladimir Ilʹich, 1870-1924250
- United States. Congress. House. Committee on Un-American Activities. (1945-1969)201
- United States. Congress. Senate. Committee on the Judiciary. Subcommittee to Investigate the Administration of the Internal Security Act and Other Internal Security Laws178
- Marx, Karl, 1818-1883160
- Trotsky, Leon, 1879-1940156
- Mao, Zedong, 1893-1976155
- Owen, Robert, 1771-1858124
- United States. Congress. House113
- United States. Congress. Senate. Committee on the Judiciary112
- Browder, Earl, 1891-1973103
- Stalin, Joseph, 1878-1953103
- Engels, Friedrich, 1820-1895102
- Project Muse89
- ebrary, Inc89